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Pr�sentation de l'�diteur

By adopting this course, no confusion is created in the mind of the learner; he is impressed with gradual and permanent convictions; has nothing to unlearn; and may at length proceed with some degree of confidence to estimate the power of the entire machine, as depending on the consumption of fuel, the elasticity of steam, the dimensions of the several parts, and the force lost through friction. So it is with every science: Let an outline be given of its leading features, that the beginner may arrrive at some notion of its purport and bearings; let this be followed by the details ;and the details by the higher reasonings and philosophy of its problems. Under this conviction these volumes have been prepared; and it will be a source of unmingled satisfaction to the Author to find his views corroborated by the experience of intelligent and competent teachers. One word to those who may object that these Text-books do not contain enough of the hard facts of the science. It had been an easy matter for the Author to have loaded his pages with minute mineral distinctions, enumeration of localities, and lists of fossil species; but had he done so, he could not have chosen a more effectual plan to disgust the learner and retard his progress. What he has aimed at was the production, not only of class-books for schools, but readable manuals for self-instruction treatises that in their readableness might imbue the student with the spirit and methods of Geology, rather than cram him with its details, many of which, in the progressive state of the science, are merely temporary and provisional.
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